I don't know if one is better than the other, I do notice vibration in my window mounted mirror (but it was bumped at a car show and is loose in one corner, so it may improve when I re-glue it) If you don't have mounting holes in the door, I personally don't like the idea of drilling the car, but if the holes are already there, then you either use them or fill/paint them.
To reduce blind spots, some folks put a small convex stick-on mirror at the outside edge of their mirror.
There's an article on PanteraPlace about the Vitaloni, and has a shot of 4 mirror styles that Mike Drew took for the article, he's not that far from SF, so if you contacted him maybe a trip up I80 would give you a chance to see some options using the 2-sided tape (assuming he still has a bunch of mirrors on hand)
Vitaloni Mirrors Article